Guest Editors
Lennon Ó Náraigh, University College Dublin, Ireland.
Prashant Valluri, University of Edinburgh, UK.
Summary
The symposium is focused on the computational modelling of instabilities and turbulence in separated two phase flow. As such, contributions from researchers working on such flows are invited, including but not limited to the following aspects:
1) Recent algorithmic developments in level-set, volume-of-fluid, Diffuse-Interface, Lattice-Boltzmann, Front Tracking;
2) Recent developments in the understanding of the instabilities in such fluids, e.g. linear and nonlinear instability;
3) High-performance computing aspects, including possible direction of research in the context of exascal computing;
4) Postprocessing and model validation, including Statistical Learning and Uncertainty Quantification;
5) Input from experimentalists working in the area;
6) Industrial and technical applications of two-phase flows.
Further contributions from multiphase flow broadly are also welcomed, especially if they can provide insight in the above main topical areas.
Keywords
computational fluid dynamics, industrial and technical application of two-phase flows
Published Papers
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Open Access
ARTICLE
Numerical Fluid Flow Modelling in Multiple Fractured Porous Reservoirs
Yatin Suri, Sheikh Zahidul Islam, Kirsten Stephen, Cameron Donald, Michael Thompson, Mohamad Ghazi Droubi, Mamdud Hossain
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 245-266, 2020, DOI:10.32604/fdmp.2020.06505
（This article belongs to this Special Issue:
CFD Modeling and Multiphase Flows)
Abstract This paper compares the fluid flow phenomena occurring within a fractured
reservoir for three different fracture models using computational fluid dynamics. The effect
of the fracture-matrix interface condition is studied on the pressure and velocity distribution.
The fracture models were compared based on the variation in pressure and permeability
conditions. The model was developed for isotropic and anisotropic permeability conditions.
The results suggest that the fracture aperture can have a drastic effect on fluid flow. The
porous fracture-matrix interface condition produces more realistic transport of fluids. By
increasing the permeability in the isotropic porous matrix, the pressure drop was significantly…
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Open Access
ARTICLE
Heat and Mass Transfer Characteristics of Alkali Metals in a Combined Wick of High-Temperature Heat Pipe
Ping Yu, Chuanhui Huang, Lei Liu, Huafeng Guo, Chengqiang Liu
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 267-280, 2020, DOI:10.32604/fdmp.2020.06528
（This article belongs to this Special Issue:
CFD Modeling and Multiphase Flows)
Abstract To study the heat and mass transfer characteristics of alkali metals in a
combined porous wick in high-temperature heat pipes, a three-dimensional (3-D)
numerical model is constructed by using the finite volume method, Darcy’s theory, and
the theory of local thermal equilibrium. The research finds that the pressure drop of
fluids flowing through a combined porous wick exhibits an increasing trend with
increasing flow velocity at the inlet and with decreasing permeability of the porous
media; a combined porous wick of lower porosity and permeability and larger fluid
velocity at the inlet is found to have a less uniformly distributed…
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Open Access
ARTICLE
Numerical Simulation of Fluid and Heat Transfer in a Biological Tissue Using an Immersed Boundary Method Mimicking the Exact Structure of the Microvascular Network
Yuanliang Tang, Lizhong Mu, Ying He
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 281-296, 2020, DOI:10.32604/fdmp.2020.06760
（This article belongs to this Special Issue:
CFD Modeling and Multiphase Flows)
Abstract The aim of this study is to develop a model of fluid and heat transfer in a
biological tissue taking into account the exact structure of the related microvascular
network, and to analyze the influence of structural changes of such a network induced by
diabetes. A cubic region representing local skin tissue is selected as the computational
domain, which in turn includes two intravascular and extravascular sub-domains. To save
computational resources, the capillary network is reduced to a 1D pipeline model and
embedded into the extravascular region. On the basis of the immersed boundary method
(IBM) strategy, fluid and heat…
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Open Access
ARTICLE
Numerical Modelling of Proppant Transport in Hydraulic Fractures
Yatin Suri, Sheikh Zahidul Islam, Mamdud Hossain
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 297-337, 2020, DOI:10.32604/fdmp.2020.08421
（This article belongs to this Special Issue:
CFD Modeling and Multiphase Flows)
Abstract The distribution of proppant injected in hydraulic fractures significantly affects
the fracture conductivity and well performance. The proppant transport in thin fracturing
fluid used during hydraulic fracturing in the unconventional reservoirs is considerably
different from fracturing fluids in the conventional reservoir due to the very low viscosity
and quick deposition of the proppants. This paper presents the development of a threedimensional Computational Fluid Dynamics (CFD) modelling technique for the prediction
of proppant-fluid multiphase flow in hydraulic fractures. The proposed model also simulates
the fluid leak-off behaviour from the fracture wall. The Euler-Granular and CFD-Discrete
Element Method (CFD-DEM) multiphase modelling approach…
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Open Access
ARTICLE
Study on Dynamic Prediction of Two-Phase Pipe Flow in Inclined Wellbore with Middle and High Yield
Xiaoya Feng, Wei Luo, Yu Lei, Yubin Su, Zhigang Fang
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 339-358, 2020, DOI:10.32604/fdmp.2020.08564
（This article belongs to this Special Issue:
CFD Modeling and Multiphase Flows)
Abstract Gas-liquid two-phase flow is ubiquitous in the process of oil and gas exploitation,
gathering and transportation. Flow pattern, liquid holdup and pressure drop are important
parameters in the process of gas-liquid two-phase flow, which are closely related to the
smooth passage of the two-phase fluid in the pipe section. Although Mukherjee, Barnea
and others have studied the conventional viscous gas-liquid two-phase flow for a long time
at home and abroad, the overall experimental scope is not comprehensive enough and
the early experimental conditions are limited. Therefore, there is still a lack of systematic
experimental research and wellbore pressure for gas-liquid…
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Open Access
ARTICLE
On the Liquid-Vapor Phase-Change Interface Conditions for Numerical Simulation of Violent Separated Flows
Matthieu Ancellin, Laurent Brosset, Jean-Michel Ghidaglia
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 359-381, 2020, DOI:10.32604/fdmp.2020.08642
（This article belongs to this Special Issue:
CFD Modeling and Multiphase Flows)
Abstract Numerous models have been proposed in the literature to include phase change
into numerical simulations of two-phase flows. This review paper presents the modeling
options that have been taken in order to obtain a model for violent separated flows with
application to sloshing wave impacts. A relaxation model based on linear non-equilibrium
thermodynamics has been chosen to compute the rate of phase change. The integration in
the system of partial differential equations is done through a non-conservative advection
term. For each of these modelling choices, some alternative models from the literature
are presented and discussed. The theoretical framework for all…
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Open Access
ARTICLE
Linear and Nonlinear Stability Analysis in Microfluidic Systems
Lennon Ó Náraigh, Daniel R. Jansen van Vuuren
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 383-410, 2020, DOI:10.32604/fdmp.2020.09265
（This article belongs to this Special Issue:
CFD Modeling and Multiphase Flows)
Abstract In this article we use analytical and numerical modeling to describe parallel
viscous two-phase flows in microchannels. The focus is on idealized two-dimensional
geometries, with a view to validating the various methodologies for future work in three
dimensions. In the first instance, we use analytical Orr-Sommerfeld theory to describe
the linear instability which governs the formation of small-amplitude waves in such
systems. We then compare the results of this analysis with an in-house Computational Fluid
Dynamics (CFD) solver called TPLS. Excellent agreement between the theoretical analysis
and TPLS is obtained in the regime of small-amplitude waves. We continue the numerical…
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